crypto/tls: re-enable RSA-PSS in TLS 1.2 again

TLS 1.3, which requires RSA-PSS, is now enabled without a GODEBUG
opt-out, and with the introduction of
Certificate.SupportedSignatureAlgorithms (#28660) there is a
programmatic way to avoid RSA-PSS (disable TLS 1.3 with MaxVersion and
use that field to specify only PKCS#1 v1.5 SignatureSchemes).

This effectively reverts 0b3a57b5374bba3fdf88258e2be4c8be65e6a5de,
although following CL 205061 all of the signing-side logic is
conveniently centralized in signatureSchemesForCertificate.

Fixes #32425

Change-Id: I7c9a8893bb5d518d86eae7db82612b9b2cd257d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/205063
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
28 files changed
tree: 6a72a78e4bcba87bb7a4c41ea5e9c2fe67a36473
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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